Bollywood megastar Amitabh Bachchan is upset with the fact that someone has created a Twitter ID replicating his and is writing "rubbish" about Shah Rukh Khan's just released sci-fi superhero film "RA.One".

Amitabh Bachchan

"Fake ID of mine being used to write opinions on 'RA.One'...I have not even seen the film and shall always wish the best for Shah Rukh," the 69-year-old posted on micro-blogging site Twitter.